- #1

chiuda

- 36

- 0

## Homework Statement

Base ball player makes perfect contact with a ball striking it at 45° angle above the horizontal at a point 1.3 m above the ground. His ball just makes it clear of the 3m wall 130m from home plate. What was the velocity at with he struck the ball.

## Homework Equations

is my final answer correct? i think my steps are good and that my assumptions are perfectly reasonable but i am getting a very unrealistic answer, please can somebody help me it would be very appreciated?! :)

## The Attempt at a Solution

Ok so i assumed that when the question states the ball just makes it over the wall that its vertical velocity is 0m/s then assuming that i plugged it into this kinematic equation

d=(v2)(t)- (1/2)(a)(t)^2 (note i am trying to find time just through the vertical components) i then subtracted the height of which the ball was hit with where v2 was 0m/s which is 3m giving me 1.7 m for vert displacement so i have d i have v2 and i have a with is -9.8m/s^2. after plugging this into the equation and solving for t i get 0.6s. i then move on to find the horizontal velocity since it is constant and i now have time so i plug it into v=d/t because i have d horizontal (130m) and t (0.6s) from this i get 217 m/s (v horizontal) i then automatically know vi= 217 m/s as well because it was projected at a 45° angle then i use pathagreans theorem and solve for Vi and end up with 307 m/s [45°].